U.S. patent number 3,761,869 [Application Number 05/232,803] was granted by the patent office on 1973-09-25 for connector.
This patent grant is currently assigned to Bell Telephone Laboratories, Incorporated, Western Electric Company, Incorporated. Invention is credited to Edwin Charles Hardesty, Charles Louis Krumreich, Albert Eugene Mulbarger, Jr., Stephen William Walden.
United States Patent |
3,761,869 |
Hardesty , et al. |
September 25, 1973 |
**Please see images for:
( Certificate of Correction ) ** |
CONNECTOR
Abstract
The connector is adapted to terminate a cord having a
multiplicity of insulated conductors arranged in a spaced linear
array. The connector comprises a pair of shaped dielectric members
that when joined together include means for clamping the cord
therebetween and a multiplicity of ducts for respectively
accommodating the individual insulated conductors exposed by the
removal of the insulating jacket from the end of the cord. One of
the connector members includes a ledge adjacent to the forward end
of the ducts against which the ends of the conductors are trimmed.
A multiplicity of openings exposed to the exterior of the connector
respectively communicate with the ducts, and an individual blade
terminal is inserted in each opening. Each blade terminal includes
barbs that lock it in place and tangs that pierce the insulation of
and make electrical contact with the conductor in the associated
duct. An edge of each terminal is exposed to the exterior of the
connector and serves as the external contact surface.
Inventors: |
Hardesty; Edwin Charles (Perry
Hall, MD), Krumreich; Charles Louis (Indianapolis, IN),
Mulbarger, Jr.; Albert Eugene (Indianpolis, IN), Walden;
Stephen William (Indianapolis, IN) |
Assignee: |
Western Electric Company,
Incorporated (New York, NY)
Bell Telephone Laboratories, Incorporated (Murray Hill,
NJ)
|
Family
ID: |
26709425 |
Appl.
No.: |
05/232,803 |
Filed: |
March 8, 1972 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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33211 |
Apr 30, 1970 |
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Current U.S.
Class: |
439/418;
439/444 |
Current CPC
Class: |
H01R
24/62 (20130101) |
Current International
Class: |
H01R
13/00 (20060101); H01R 13/62 (20060101); H01R
13/46 (20060101); H04M 1/00 (20060101); H01r
009/08 () |
Field of
Search: |
;339/97-99,220,221,103,105,107 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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479,961 |
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Nov 1969 |
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CH |
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290,257 |
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Jun 1956 |
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NL |
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Primary Examiner: McGlynn; Joseph H.
Parent Case Text
CROSS REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of application Ser. No.
33,211 filed Apr. 30, 1970, and assigned to the same assignee as
the present application.
Claims
What is claimed is:
1. A connector for terminating a cord incluidng a plurality of
insulated conductors, the connector comprising;
a dielectric enclosure having a plurality of ducts for receiving
individual conductors therein and a plurality of openings for
receiving individual terminals therein, each opening communicating
with an individual duct and including a groove in the exterior of
the enclosure; and
a plurality of electrically conducting terminals, each terminal
being positioned within an individual terminal receiving opening
and comprising a flat blade-like member including an internal
contact portion extending into the associated duct and having means
for piercing the insulation of and making electrical engagement
with the individual conductor positioned therein, each terminal
further including an external contact portion entirely contained
within the associated groove, the contact surface of each external
contact portion consisting of an edge facing outwardly from the
associated groove.
2. A connector as in claim 1 wherein the ducts in the enclosure are
arranged in essentially the same spaced array as the conductors
accommodated thereby are arranged in the cord that the connector
terminates.
3. A connector as in claim 1 wherein the external contact portion
of each terminal is recessed within the associated groove.
4. A connector as in claim 1 wherein each terminal is held on edge
within the associated terminal receiving opening, the external
contact portion of each terminal extending parallel to the length
of and being approximately centered between the sides of its
associated groove.
5. A connector as in claim 1 wherein the ducts extend parallel to
one another along their length, are located adjacent to a forward
end of the enclosure and extend to and are open at that end.
6. A connector as in claim 5. further including a ledge protruding
from the forward end of the enclosure, the ledge including a flat
surface adjacent to the open ends of the ducts.
7. A connector as in claim 5 wherein the rear portion of the
enclosure includes a flared inlet in which the cord terminated by
the connector is positioned, the inlet comprising a pair of opposed
arcuate surfaces that at their closest point are spaced
approximately the same distance apart as the height of the cord and
diverge continuously from this point to the rear end of the
inlet.
8. A connector as in claim 7 wherein the inlet further includes a
pair of planar surfaces spaced approximately the same distance
apart as the height of the cord and the opposed arcuate surfaces
diverge continuously from the planar surfaces.
9. A connector for terminating a cord including a plurality of
insulated conductors, the connector comprising:
a dielectric enclosure having
a plurality of ducts for receiving individual conductors therein,
the ducts extending parallel to one another along their length and
being arranged in essentially the same spaced array as the
conductors accommodated thereby are arranged in the cord that the
connector terminates, the ducts being located adjacent to one end
of the enclosure and extending to and being open at that end,
and
a plurality of openings for receiving individual terminals therein,
the terminal entrance to each opening comprising a groove in the
exterior of the enclosure and the other end of each opening
communication with an individual duct; and
a plurality of electrically conducting terminals, each terminal
being positioned within an individual terminal receiving opening
and comprising a flat blade-like member including an internal
contact portion extending into the associated cuts and having means
for piercing the insulation of and making electrical engagement
with the individual conductor positioned therein, each terminal
further including an external contact portion entirely contained
and recessed within the associated groove and being approximately
centered between the walls defining the groove, the contact surface
of the external contact portion consisting of an edge facing
outwardly from the groove.
10. A connector as in claim 9 further including a flared inlet at
the other end of the enclosure from the ducts for accommodating the
cord terminated by the connector, the inlet comprising a pair of
opposed arcuate surfaces that at their closest point are spaced
approximately the same distance apart as the height of the cord and
diverge continuously from this point.
Description
FIELD OF THE INVENTION
This invention relates to the field of electrical connectors and
within that field to the plug or male type of connector.
BACKGROUND OF THE INVENTION
The direction of the electrical technology today is toward smaller
and smaller components, and this is no less true with respect to
electrical connectors than it is with respect to other discrete
components. However, one major problem in this movement toward
miniaturization of connectors is manufacturability. As connectors
become smaller, they typically become more difficult and
consequently more expensive to manufacture.
SUMMARY OF THE INVENTION
The connector of the present invention lends itself to
miniaturization, but in addition it is designed so that the
elements of the connector can be assembled and the connector
attached to the cord that it terminates by automated machinery even
when the connector is so miniaturized.
The connector comprises a pair of shaped dielectric members that
when joined together form an enclosure including (1) a multiplicity
of ducts arranged in a spaced linear array for respectively
accommodating the individual insulated conductors of the cord, (2)
a constricted tortuous passageway for clamping the cord in place,
and (3) a flared inlet for reducing the bending stress on the cord
when it is flexed. The enclosure further includes a ledge
protruding from the forward end thereof and a multiplicity of
openings exposed to its exterior that respectively communicate with
the conductor receiving ducts. An individual blade terminal is
accommodated by each opening, and each terminal includes a barb on
each side, a pair of tangs at one end, and a flat edge at the other
end.
The elements of the connector are assembled to the cord by first
removing the jacket from the end of the cord to expose the
insulated conductors, the cord being formed to locate the insulated
conductors in essentially the same spaced linear array as the ducts
in the connector. The cord is then positioned with the jacketed
portion of the cord located in the constricted tortuous passageway
portion of the first of the shaped members. Because of their
spacing, the insulated conductors are at the same time
automatically located in the individual duct portions of the first
member, the free ends of the conductors extending beyond the front
end of the member.
The second shaped member is then placed into engagement with the
first member, the members including guide elements that properly
locate one with respect to the other, and the members are
ultrasonically bonded together. At approximately the same time, the
free ends of the conductors are trimmed off flush with the front
ends of the ducts by a cutting edge moving against the protruding
ledge, and the terminals are inserted into the accommodating
openings. The barbs of each terminal lock it in place and the tangs
pierce the insulation of, and make electrical contact with, the
conductor in the associated duct. The flat edge of each terminal is
exposed to the exterior of the connector and serves as the surface
that makes electrical contact with the mating connector.
DESCRIPTION OF THE DRAWING
FIG. 1 is a perspective showing the male connector of this
invention separated from a mating female connector, portions being
broken away for greater clarity;
FIG. 2 is an exploded perspective view showing the enclosure
members and blade contact and the cord terminated by the connector
of this invention.
FIG. 3 is an exploded perspective view showing the enclosure
members inverted from their position in FIG. 2; and
FIGS. 4 and 5 are sectional views taken along lines 4--4 and 5--5
respectively of FIG. 1, showing the relationship of the assembled
elements of the connector.
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1 of the drawing, the male connector 10 of this
invention is shown in position to be inserted into a female
connector 100 with which it mates. The connector 10 includes an
enclosure 15 that comprises a pair of shaped members that for
convenience of description will be referred to as a base 200 and a
top 300. The base 200 and top 300 are advantageously molded as
integral members, using conventional injection molding techniques,
from a dielectric material such as polycarbonate molding
compound.
As shown by reference to both FIGS. 1 and 2, the base 200 has
spaced side walls 210 each of which includes a horizontal mating
surface 212 to the front of and an inclined mating surface 214 to
the rear of a tongue 126. Between the side walls 210, the interior
surface of the base 200 has three spaced ridges 220, and the ridges
in conjunction with the side walls define four troughs 222 that
include a horizontal portion 224 at the forward end of the base and
an inclined portion 226 of the rear of the horizontal portion. The
inclined portion 226 terminates at an upstanding protuberance 230,
and an inlet portion 240 is situated to the rear of the
protuberance. The inlet portion 240 comprises a horizontal surface
242 joining a convex surface 244, the latter curving continuously
from the horizontal surface toward the underside of the base
200.
The base 200 further includes a ledge 250 that protrudes from the
forward end and underside thereof. The ledge 250 includes a flat
surface 252 that underlies the forward end of the troughs 222 while
a latch 260 extends rearwardly from the lower end of the ledges.
The latch comprises an integral hinge portion 262, a pair of
locking shoulders 264, and a tab 266. The latch 260 normally
extends at an angle to the underside of the base 200, but the hinge
portion 262 permits it to be deflected toward the underside by
means of the tab 266.
Turning now to both FIGS. 2 and 3, the top 300 of the enclosure 15
has interior surfaces complementary to those of the base 200. Thus,
the top 300 has spaced side walls 310 each of which includes a
horizontal mating surface 312 to the front of and an inclined
mating surface 314 to the rear of a notch 316. The inclined mating
surfaces 314 extend at the same angle as the inclined mating
surfaces 214 of the base 200, while the notches 316 are of a size
to just accommodate the tongues 216. Consequently, the mating
surfaces 212, 312, and 214, 314 in conjunction with the tongues 216
and notches 316 serve to properly locate the top 300 on the base
200.
The interior surface of the top 300 between the side walls 310
includes three spaced ridges 320 that define four troughs 322. The
size and configuration of ridges 320, the spacing between the
ridges, and the position of the ridges with respect to the sides
are the same as the ridges 220 in the base 200. Thus the size and
location of the troughs 322 in the top 300 are the same as the
troughs 222 in the base 200. In addition, the troughs 322 like the
troughs 222 have a horizontal portion 324 at the forward end of the
top 300 and an inclined portion 326 to the rear of the horizontal
portion. The inclined portion 326 of the troughs 322 extend at
approximately the same angle as the inclined portion 226 of the
troughs 222, but the former is approximately half as long as the
latter. Furthermore, the inclined portion 326 terminates at a
channel 330 rather than at a protuberance as in the case of the
inclined portion 226, the channel lying between the inclined
portion and a transverse wall 335.
An inlet portion 340 comprising a horizontal surface 342 joined to
a convex surface 344 is positioned to the rear of a transverse wall
335 and the convex surface curves continuously from the horizontal
surface toward the oppositely facing surface of the top 300. The
horizontal surface 342 is the same size as the horizontal surface
242 in the base 200 and has the same location with respect to the
rear end of the top 300 as the horizontal surface 242 has with
respect to the rear end of the base. In addition, the convex
surface 344 has the same radius of curvature as the convex surface
244 of the base. Consequently, the inlet portion 340 of the top 300
has the same configuration and location as the inlet portion 240 of
the base 200.
As a result of these relationships, when the top 300 is positioned
on the base 200 the troughs 322 are in registration with the
troughs 222 and they cooperate to form ducts 20 as shown in FIG. 4.
The sides of the ducts 2o are not completely closed inasmuch as the
crests of the ridges 220 and 320 are spaced from one another, but
the troughs 222 and 322 are shaped so that the ducts are
approximatley the same size as the insulated conductors of the cord
that the connector 10 terminates. As shown in FIG. 5, the forward
ends of the ducts 20 are open, and the ducts extend horizontally
from the forward end of the enclosure 15 and then incline toward
the underside thereof.
Just to the rear of the ducts 20, the protuberance 230 of the base
200 cooperates with the channel 330 and the transverse wall 335 in
the top 300 to form a constricted tortuous passageway 30. The
passageway 30 includes two sharp turns and the opposing surfaces
thereof are spaced closer together than the height of the cord
positioned therein. Finally, at the rear end of the enclosure 15
the inlet portion 240 of the base 200 cooperates with the inlet
portion 340 of the top 300 to form a flared inlet 40. The
horizontal surfaces 242 and 342 are spaced from one another so that
the narrow portion of the inlet 40 has approximately the same
configuration as the cord accommodated thereby, while the convex
surfaces 244 and 344 provide a continuously diverging orifice at
the rear of the enclosure 15.
Turning now to FIGS. 2, 3, 4, and 5, the top 300 further includes
four terminal-receiving openings 350, each of which extends between
the upper surface of the top and the side of an individual duct 20.
As seen most clearly in FIGS. 4 and 5, each opening 350 comprises a
groove 352 in the top surface that overlies and extends parallel to
the associated duct 20, the entire length of the groove being
exposed to the upper surface of and the end of the groove being
exposed to the front surface of the top 300. Each opening 350
further comprises a slot 354 that communicates directly with the
duct and a recess 356 intermediate the groove and the slot, the
recess 356 being larger than the slot 354 and including abutments
358.
Turning now to both FIGS. 2 and 5, the terminals 50 respectively
accommodated by the openings 350 comprise flat blade-like members
that are advantageously formed from an electrically conductive
resilient material such as phosphorbronze, and are gold plated.
Each terminal 50 comprises a pair of tangs 52 at the lower end
thereof, a crown 54 at the upper end thereof, and a pair of barbs
55, a stem 56, and a pair of shoulders 58 between the tangs and the
crown.
The tangs 52 comprise the significant part of the internal contact
portion of the terminal in that they pierce the insulation of and
penetrate the conductor contained in the associated duct 20. To
assure this penetration the tangs 52 are coined so that they
diverge slightly away from one another when viewed from the side
edge. The tangs 52 are of a size to pass through the slot 354 of
the opening 350 but the ends of the barbs 55 are spaced slightly
farther apart than the sides of a slot to provide an interference
fit therewith. Similarly, the stem 56 is of a size to pass through
the slot 354 while the shoulders 358 are of a size to substantially
occupy the recess 356, and the engagement of the shoulders with the
abutments 358 of the recess serves to properly locate the terminal
50 within the opening 350. The crown 54 serves as the external
contact portion of the terminal 50 in that it is positioned within
the groove 352 of the opening 350 and is therefore exposed to the
exterior of the enclosoure 15. The edge of the crown 54 is the
surface that provides electrical connection with the contact of the
mating connector.
The cord 60 terminated by the connector 10 comprises four insulated
conductors 62 contained within a jacket 64. The jacket 63 holds the
insulating conductors 62 in a linear array in which the spacing
therebetween is essentially the same as the spacing between the
ducts 20. Furthermore, the jacket 64 advantageously has a spine 65
extending lengthwise along a single side thereof to facilitate
identification of the individual conductors should the insulation
on the conductors not be color coded.
Referring still to FIGS. 2 and 5, in the assembly of the connector
10, the jacket 64 is first stripped far enough from the end of the
cord 60 so that the length of the insulated conductors 62 thereby
exposed is somewhat greater than the length of the ducts 20. The
cord 60 is then oriented so that the insulated conductors 62 lie in
the same plane as the troughs 222 in the base 200, and the jacketed
end of the cord is positioned between the tongues 216 of the base.
Because the insulated conductors 62 have approximately the same
spacing as the troughs 222, this placement of the cord 60
automatically positions the insulated conductors in alignment with
the troughs.
The top 300 is thereafter positioned so that the horizontal mating
surfaces 312 and inclined mating surfaces 314 thereof are
respectively oriented in the same manner as the horizontal mating
surfaces 212 and inclined mating surfaces 214 of the base 200, and
the top is placed on the base. The interaction of the tongues 216
in the base 200 with the notches 316 in the top 300 guides the top
into proper registration with the base whereby the troughs 322 are
juxtaposed with the troughs 222, the channel 330 is juxtaposed with
the protuberance 230, and the inlet portion 340 is juxtaposed with
the inlet portion 240.
As the top 300 is moved down on the base 200, the transverse wall
335 of the top presses into the cord 60 to hold it in place and the
ridges 320 cooperate with the ridges 220 to properly locate each
insulated conductor 62 within the duct 20 formed by the associated
troughs 322 and 222. The free ends of the insulated conductors 62
extend beyond the forward end of the ducts 20, and they are
advantageously trimmed off as the top 300 is moving down. This is
because as the top 300 moves into full engagement with the base 200
the snubbing action of the inclined portion 326 of the troughs 322
on the insulated conductors 62 serves to retract the conductors
from the ends of the ducts 20. Thus, if the free ends are cut off
flush with the ends of the ducts 20 before full engagement of the
top 300 with the base 200, any possibility of exposed electrical
conductors is eliminated. The trimming of the free ends of the
insulated conductors 62 is advantageously achieved by a cutting
edge moving down against the flat surface 252 of the ledge 250.
The top 300 is advantageously joined to the base 200 by ultrasonic
bonding, and energy directors 318 (FIG. 3) are provided on mating
surfaces 312 and 314 of the top to facilitate this operation. With
the top 300 and base 200 joined, the constricted tortuous
passageway 30 thereby formed tightly grips the cord 60 so that any
longitudinal tension on the cord is not transmitted to the
conductors 62 in the ducts 20. Furthermore, the flared inlet 40
prevents any sharp flexure of the cord 60 from being transmitted to
the portion of the cord located within the constricted tortuous
passageway 30.
The joining of the top 300 to the base 200 also acts to trap each
insulated conductor 62 within the associated duct 20, and
consequently the terminals 50 are respectively inserted into the
terminal receiving openings 350 at the same time as or subsequent
to this joining. Each terminal 50 is simply pressed down into an
opening 350 until the shoulders 58 engage abutments 358 of the
recess 356. The tangs 52 pierce the insulation of and penetrate the
conductor contained within the associated duct 20 while the barbs
55 bite into the wall of the slot 354 to lock the terminal 50 in
place. The crown 54 of the terminal 50 is situated in the groove
352 and is thereby exposed to the exterior of the enclosure 15.
Turning now to FIG. 1 the female connector or jack 100 with which
the connector 10 mates includes four wire spring contacts 110 that
extend rearwardly cantilever fashion from the mouth of the jack. As
the connector 10 is inserted into the jack 100, the lower end of
the ledge 250 is received by an opening 115 in the front of the
jack, while the remainder of the enclosure 15 is accommodated
between a top surface 120, side walls 125, and side ledges 130.
Further movement of the connector 10 into the jack 100 results in
each wire spring contact 110 being captured within a groove 352 in
the connector and the latch 260 being received by the opening
115.
As insertion of the connector 10 continues, the upper edge of the
crown 54 of each terminal 50 engages the side of the associated
wire spring contact 110, slides along its length, and deflects it
upward. The wiping action of the contact surfaces of both the
terminal 50 and the wire spring contact 110 in combination with the
contact pressure generated by the deflection of the wire spring
contacts produces a good electrical connection therebetween. At the
same time, th latch 260 is deflected upward by its engagement with
the bottom of the opening 115, and when the connector 10 is fully
inserted into the jack 100, the locking shoulders 264 of the latch
move behind a notched wall 135 to lock the connector within the
jack. Removal of the connector 10 from the jack 110 is achieved by
deflecting the tab 266 of the latch 260 upward so as to move the
locking shoulders 264 from behind the notched wall 135.
Although the ducts 20 in the connector 10 are formed by the
positioning of troughs in the base 200 and top 300 in registration
with one another, the ducts could also be formed by the positioning
of a relieved continuous surface (i.e., a surface relieved to the
same depth as the troughs but uninterrupted by ridges) in one
member in registration with troughs in the other member or by the
positioning of an unrelieved surface in one member in registration
with troughs of greater depth in the other member. These and other
modifications be made without departing from the scope and spirit
of this invention as defined in the appended claims.
* * * * *